Title:
METHOD FOR CONCENTRATION OF HEAVY NITROGEN ISOTOPE
Document Type and Number:
WIPO Patent Application WO/2007/122893
Kind Code:
A1
Abstract:
Disclosed is a method for concentrating 15N, a heavy nitrogen isotope,
to the level of 50 atm% or greater with high efficiency. The method employs two
or more distillation columns (T1 - T4) each equipped with at least one condenser
(C1 – C4) and at least one reboiler (R1 – R4). These distillation
columns are serially connected to continuously distill nitrogen N2
at a low temperature, thereby concentrating an isotope molecule 14N15N
and/or 15N2 which contains a heavy nitrogen isotope 15N.
A portion of the nitrogen under distillation is drawn out and subjected to isotope
scrambling by means of an isotope scrambler (S1), and at least a portion of the
nitrogen yielded after the isotope scrambling is returned to the distillation
step. In this manner, nitrogen N2 having a 15N condensation
degree of 50 atom% or greater.
Inventors:
KIHARA HITOSHI (JP)
KAMBE TAKASHI (JP)
HAYASHIDA SHIGERU (JP)
KAMBE TAKASHI (JP)
HAYASHIDA SHIGERU (JP)
Application Number:
PCT/JP2007/054765
Publication Date:
November 01, 2007
Filing Date:
March 12, 2007
Export Citation:
Assignee:
TAIYO NIPPON SANSO CORP (JP)
KIHARA HITOSHI (JP)
KAMBE TAKASHI (JP)
HAYASHIDA SHIGERU (JP)
KIHARA HITOSHI (JP)
KAMBE TAKASHI (JP)
HAYASHIDA SHIGERU (JP)
International Classes:
B01D59/04; F25J3/02
Domestic Patent References:
| WO2000027509A1 | 2000-05-18 |
Foreign References:
| JP2001104756A | 2001-04-17 | |||
| JPH0347518A | 1991-02-28 | |||
| JP2006080345A | 2006-03-23 | |||
| JPH11188240A | 1999-07-13 | |||
| JP2003210945A | 2003-07-29 |
Other References:
TAIYO NISSAN GIHO, no. 23, 2004, pages 20 - 25
See also references of EP 1997551A4
See also references of EP 1997551A4
Attorney, Agent or Firm:
SHIGA, Masatake et al. (Yaesu Chuo-k, Tokyo 53, JP)
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